AdRequest.swift

import UIKit

struct NMAdLocation {
  var categoryId: String
  var categoryName: String
  var subcategoryId: String
  var subcategoryName: String
  var articleUrl: String?
  
  init(categoryId: String, categoryName: String, subcategoryId: String, subcategoryName: String, articleUrl: String? = nil) {
    self.categoryId = categoryId
    self.categoryName = categoryName
    self.subcategoryId = subcategoryId
    self.subcategoryName = subcategoryName
    self.articleUrl = articleUrl
  }
}

class AdController {
  
  static let sharedInstance = AdController()

  /// Downloads and saves the ad setting JSON
  func requestAdSettings(withCompletion completion: (success: Bool) -> Void) {
  }
  
  func generateAdRequesterWithLocation(location: NMAdLocation, adType: DAPAdType) -> AdRequester {
    let providers = providersForAdType(adType, withLocation: location)
    return AdRequester(providers: providers)
  }
  
  private func providersForAdType(adType: DAPAdType, withLocation location: NMAdLocation) -> [AdProvider] {
    //Look at config to determine which providers are relevent to this request
    //Inject appropriate advice to each provider
    return [AdProvider]() //TODO
  }
  
  private func adAdviceForLocation(location: NMAdLocation) -> AdAdvice {
    return AdAdvice(adLocation: location, lat: 0, long: 0) //TODO
  }
  
}

protocol AdRequestListener {
  func adRequestSucceeded(adType: DAPAdType)
  func adRequestFailed(error: NSError)
}

class AdRequester {
  
  private let providers: [AdProvider]
  var delegate: AdRequestListener?
  let adViewContainer: UIView
  
  init(providers: [AdProvider]) {
    self.providers = providers
    self.adViewContainer = UIView() //Each Ad Provider should make its own view
  }
  
  func beginAdRequest() {
    //Set up timer if we are refreshable
    requestAd()
  }
  
  private func requestAd() {
    for provider in providers {
      provider.requestAd()
    }
  }
}

class BannerAdRequester: AdRequester {
  
}

class AdProvider {
  
  private let advice: AdAdvice
  
  init(advice: AdAdvice) {
    self.advice = advice
  }
  
  func requestAd() {
  }
  
}

class DFPAdProvider: AdProvider {
  
}

struct AdAdvice {
  var adLocation: NMAdLocation
  var lat: Float
  var long: Float
}


class SampleViewController: UIViewController, AdRequestListener {
  
  private var bannerAdRequester: AdRequester?
  
  override func viewDidLoad() {
    let location = NMAdLocation(categoryId: "0", categoryName: "0", subcategoryId: "Sample", subcategoryName: "Sample")
    let bannerAdRequester = AdController.sharedInstance.generateAdRequesterWithLocation(location, adType: DAPAdType.MobileBanner)
    self.bannerAdRequester = bannerAdRequester
    view.insertSubview(bannerAdRequester.adViewContainer, atIndex: 0)
    //Hook up adViewContainer into our layout
    bannerAdRequester.delegate = self
    bannerAdRequester.beginAdRequest()
  }
  
  func adRequestSucceeded(adType: DAPAdType) {
    //Move bannerAdRequester.adViewContainer on to the screen
  }
  
  func adRequestFailed(error: NSError) {
    //Move bannerAdRequester.adViewContainer off of the screen
  }
}